Baler with double-acting plunger

A hay baler comprising a mobile frame, a hay pickup mounted on one side of the mobile frame, a pair of generally fore and aft extending bale chambers having common generally straight top, bottom and side walls, mounted on the side of the frame adjacent to the hay pickup, a hay inlet aperture in one side wall of the bale chambers substantially mid-way between the ends of the wall, feed means to feed hay from the hay pickup through the hay inlet aperture, a plunger moveably supported in the bale chambers, plunger guide means mounted on the top and bottom walls for guiding the plunger in a generally fore and aft straight line, drive means for reciprocating the plunger back and forth so that it alternately moves hay to the rear and compresses it in one of the bale chambers and then moves hay to the front and compresses it in the second bale chamber, said drive means including a shaft rotatably mounted adjacent to the bottom wall of the bale chambers, drive means to rotate the shaft, a crank member mounted on the shaft adjacent to each side wall, the forward bale chamber having a connecting rod connected to each of the crank members and a trunion projecting from each side of the plunger and the adjacent side wall of the bale chambers, the connecting rod on the side of the bale chambers adjacent to the hay pickup including a generally horizontal portion and a generally vertical portion which leave the hay inlet aperture in one side wall of the bale chamber unobstructed when the plunger moves into the rear bale chamber, and drive means to drive said feed means to feed hay from the hay pickup through the hay inlet aperture each time the plunger moves into the rear bale chamber and each time the plunger moves into the forward bale chamber.